| sour | (noun) the property of being acidic | Synonyms: acidity, sourness |
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| (noun) the taste experience when vinegar or lemon juice is taken into the mouth | Synonyms: sourness, tartness |
| (noun) a cocktail made of a liquor (especially whiskey or gin) mixed with lemon or lime juice and sugar | - |
| sourball | (noun) round piece of tart hard candy | - |
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| source | (noun) a facility where something is available | - |
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| (noun) anything that provides inspiration for later work | Synonyms: germ, seed |
| (noun) a document (or organization) from which information is obtained | - |
| (noun) a publication (or a passage from a publication) that is referred to | Synonyms: reference |
| (noun) the place where something begins, where it springs into being | Synonyms: beginning, origin, root, rootage |
| (noun) anything (a person or animal or plant or substance) in which an infectious agent normally lives and multiplies | Synonyms: reservoir |
| (noun) someone who originates or causes or initiates something | Synonyms: author, generator |
| (noun) a person who supplies information | Synonyms: informant |
| (noun) (technology) a process by which energy or a substance enters a system | - |
| sourdine | (noun) an organ stop resulting in a soft muted sound | - |
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| (noun) a mute for a violin | Synonyms: sordino |
| sourdough | (noun) a settler or prospector (especially in western United States or northwest Canada and Alaska) | - |
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| (noun) a leaven of dough in which fermentation is active; used by pioneers for making bread | - |
| souring | (noun) the process of becoming sour | - |
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| sourness | (noun) the property of being acidic | Synonyms: acidity, sour |
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| (noun) a sullen moody resentful disposition | Synonyms: moroseness, sulkiness, sullenness |
| (noun) the taste experience when vinegar or lemon juice is taken into the mouth | Synonyms: sour, tartness |
| sourpuss | (noun) someone with a habitually sullen or gloomy expression | Synonyms: gloomy Gus, picklepuss, pouter |
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| soursop | (noun) large spiny tropical fruit with tart pulp related to custard apples | Synonyms: guanabana |
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| (noun) small tropical American tree bearing large succulent slightly acid fruit | Synonyms: Annona muricata, prickly custard apple, soursop tree |
| sourwood | (noun) deciduous shrubby tree of eastern North America having deeply fissured bark and sprays of small fragrant white flowers and sour-tasting leaves | Synonyms: Oxydendrum arboreum, sorrel tree, titi |
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